Impulse transmitter



Julyy 3, 1.934'. L, KARDORF 1,965,121

IMPULSE TRANSMITTER Filed April l0. 1930 2 Sheets-Sheet 1 Ju1y:193.4'.v LKARDORFF` 1,965,121

IMPULSE TRANSMITTER Filed April 1o. 1930 2 sheets-sheet 2 nun Zwem/0r onffarclor ff Patented July 3, 1934 UNITED STATESA PATENT oFFlcE The American Self-Selector tion of New York Corp., a corpora- Application April 10, 1930, Serial No. 443,137

In Germany December 4,

5 claims. (o1. inl-38o) In establishing telephone connections by a private party or subscriber without the assistance of the staff in the telephone office, the subscriber must rotate the selection disk as many times as the telephone call number has digits or signs. This is frequently felt as an inconvenience, particularly when connections required are repeatedly found to be engaged.

The object of the present invention is to design an apparatus by the aid of which connections may readily be established by easily accomplished adjustments.

With this object in view my apparatus comprises in general a plurality of disks, one for each telephone connection or call, to be made. These disks are mounted firmly on a rotary shaft, driven by electricity or by clockwork, or otherwise. The peripheries of lthe disks are provided with offset portions, cams or teeth, the lengths'of certain offset portions and their consecutive vorder corresponding to the digits and denominations of the telephone call number, to which the disk belongs, which hereinafter I term call-disk. A slide is arranged to move parallel to the shaft of the disk and carries a yielding ngeradapted to contact with raised portions on the periphery on any disk, to which the slide may be adjusted. A contact make and break device arranged in the telephone line is connected with the said slide and adapted to be operated when the yielding iinger contacts with the portions of the periphery of the'disk, to which the slide is adjusted; means being provided for impressingsignals on the electric circuit of the by interrupting the current ow, corresponding in number to the size of the sector Jof the raised portion. l

Various constructions may be designed for causing the necessary interruptions of current. Thus in one construction the contact make and break device is mounted on the slide and may be` so constructed andy oiset" portions of the peripheries the ,disk rotating the teeth contacting with the yielding finger on the slide will directly transmit movements to the movable part of the contact make and break l necessary rapidity the desired interruptions of current, corresponding to the digits in question.

, In another constructionV a lsecond contact telephone line make and break device is arranged in the telephone line, operated by suitable means, for instance by a clockwork to rapidly open and close the contact device without cessation. Raised portions on the periphery of the call disks, be-

on the call disks so serrated, that on device to cause with the ing in this construction without teeth, will cause lthe first named contact make and break device to open, during the time the yielding finger contacts with the same, while when the ringer is intermediate the said raised portions on the peripheryof the call disk, that is to say, when the said finger does not contact with such raised portion, this contact device will keep the circuit closed, so that the second contact make and break device has no eiect on the circuit.

In-a further construction the slide provided with the lyielding finger, that contacts with raised portions on the call disks, instead of being conk nected with a contact make and break device, which in a regular manner periodically opens and closes the circuit, maybe connected with the contact make and break device operated by the clockwork or the like for enabling continuous interruptions in such manner, that the said vyielding finger is directly connected with the normally fixed, but in this instance yielding or pivoted contact piece of this contact device to pull this contact piece aside, when the circuit is to remain closed. In this case the construction may either be so designed that the yielding or pivoted contact piece is normally in a closed position, when the yielding finger on the slidev is engaged by outwardly oifset or such raised portions on the call disk, which correspond to thedigits of the call numbers. This construction may be so improved, that said yielding or pivoted-contact piece is normally in operating position, and that the portion of the periphery of the call disks, that are attributed tothe digits of the call numbers, are offset inwardly instead of outwardly, as in previously described Yconstructions, so that the portions intermediate those which belong to the digits or call numbers, are now raised portions to operate on the yielding finger of the slide to transmit movement to the yielding contact piece to turn it aside. In both these instances the raised portions on the call disk act. as cams.

Fig. 1 is 'a cross section of the apparatus onlv the line 1-1 of Fig. 3, and ,Y l

Fig. 2 a cross section on the line 2-'-,2 of Fig. 3.

Fig. 3 is a plan of the apparatus partly in section, the cover being removed. 1

Fig. 4 is part of a plan of the apparatus.

Fig. 5 is a section of a .modified apparatus 105 drawnto a smallerscale.

Fig. 6 is a cross section of a modied apparatus on the line 6-6 of` Fig. '7.

Fig. 7 is a similar view as modified apparatus.

Fig. a of thel said Fig. 8 is a modified detail of the apparatus shown in Figs. 6 and 7, and

Fig. 9 is a diagrammatic view showing the apparatus arranged in the telephone line.

In the constructions shown in Figs; l-4 within the casing a of the apparatus A, which it is well understood is to be always placed in circuit with the telephone line L of the telephone T (see Fig. 9), a clockwork b is mounted adapted to be wound up from outside by a key or handcrank c. On the shaft d adapted to be driven by the clockwork b a plurality of disks e is xedly mounted corresponding to the number of the calls for which the apparatus may be designed. Parallel to the shaft d a slide guide g is mounted inthe end walls of the casing a., and on this guide a slide h is slidably mounted, a handle i of this slide projecting outwardly through a slot 1c. Connected with the slide h is a yielding .finger or tongue m, and the disks e are provided with a number of offsets on their peripheries corresponding in number to the digits necessary for determining the local calls; thus for instance Hamburg requires 6k digits or signs, and therefore the disks are divided into 6 sections, each section having one offset f. The length of the offset corresponds to one of the signs or digits from 1-0, thus the offset for zero will have to correspond in length to ten units and the offset for the smallest number 1 will have to correspond in length to one unit, that is to say 1% of that of zero. By way of example the call D3,2492 would require offsets in length equal to 4, 3, 2, 4, 9, 2 units. W'hen thus the slide h is adjusted to a certain disk the tongue m will contact with the divers offsets f with interruptions in. lengths of time corresponding to 4, 3, 2, 4, 9, and 2 units of time during one revolution of the disks e.

It willv be noted that -the leading corners of the offset portions f of the disk `e are rounded off, or cut away to compensate for the thickness of the member m. v In some cases it`may be desirable to cut the trailing edge in the same manner tc make the practical resultant timing equal to the theoretical timing,

ing thev telephone call This operation may be made use of for securin question in various ways.

'I'hus for instance in the construction shown in Fig. 5 the tongue m is provided with a contact piece m' of a contact'make and break device m', m2 in the telephone line L. In this figure the lengths of the offsets on the disk ecorrespond to a number 02,1417, and therefore there will be on the rotation of the disk ein consecutive order' 3, 2, 1, 4, 1, 7 interruptions in the telephone line, by which the telephone connection will be completed in the usual manner.-

Instead of mechanicallyA producing interruptions as bythe aid ofthe constructionshown in Fig. 5, which may have the drawback that it is difficult to secure a correct operation of the contact pieces and therefore the disks will have to be rotated generally slow, means may be provided for continuously causing interruptions' in the telephone line and provide for securing contact in the line in another way at times, when no interruptions are wanted.

The construction shown in Figs. 1 4 is designed to fulfill this requirement. A second contact make and break device is arranged within the telephone line L. This-second contact breaker as shown in the drawings consistsof two yielding arms n, on each of which a contact piece n is mounted. In

front of these arms n a shaft o is journaled provided with a worm o driven by a worm wheel o2 operated by the clockwork b. A segment p is firmly mounted on the shaft o and made of insulating material and adapted to enter between the ends of the arm n to break contact between the Contact pieces n' on rotation of the shaft o. The ratio of the worm o', the worm gear o2 and the intermediate gear o3 is such that the shaft o is driven at a considerable speedto continuously break and make between the Contact pieces n' in rapid succession.

Similar to the construction shown in Fig. 5 the tongue m has a contact piece m forming part of the contact make and break device m and m2; the contact piece m2 being attached to the slide h by an insulated block m3, to which also' is fastened the tongue m and which by the angle piece h is rmly attached to the slide h.

In this case the contact make and break device m", m2 continuously keeps the circuit in the line L closed, no matterfwhether the contact make and break device n, n is opened or closed. When, however, on rotation of the disk e the raised offsets f engagethe tongue m the contact make and break device m', m2 will open the circuit at this place, and the contact-make and break device n, n will take the necessary effect to secure interruptions according to the lengths of the offsets f, that is to say, according to the digits and the'consecutive order corresponding to the number of the telephone call. 4

In the construction shown in Figs. 1 and 2 the shaft o is connected with a regulator consisting of spring arms p provided with weights p2 at their ends adapted to contact with a fixed ring p3, when the shaft ois driven at a certain speed, thus regulating the speed of the insulated segment p.

Aswill be understood any desired number of disks e may be mounted on the shaft d corresponding to the number of telephone calls, for which the apparatus may be constructed. In the construction shown 15 different telephone connections may be made by the apparatus. On the top of the casing, plates or panels 1c may be arranged on which the different telephone connections may be indicated constituting a staggered visual indicator.` Pointers k2 may be attached to the slide h for facilitating correct adjustment to the call disks, to which the panels correspond, which in order to save space are arrangedr in staggered relation as shown.

'I'he gearing of the clockwork b may be so designed that the pinion o3 is continuously rotated to 'secure continuous interruptions of current by the contact make and break device n', n, p, n, n', and the .shaft` d must be driven by the clockwork through a. friction clutch to secure rotation of the disks e only when the shaft d is released. This is secured by a ratchet Wheel d firmly mounted on the shaft d, and having-only onetooth d2 adapted to be engaged by the pawl d3. 'Ihe pawl d3 -is pivoted to a pin d0 and engaged opposite the pin d by a spring-premed nger rod d5 projecting Yout through the cover of the casing and provided with finger piece d6. VThe pawl d3 may be provided with a prolongation d4 adapted to engage a finger o4, when no call is made, the telephone line being in such .case closed by the contact make and break device m', m2 to allow the speech to be transmitted.

When a call is to be made the slide h Will be adjusted by the handle i to thedisk e provided with o'sets f of the requisite lengths corresponding to the number of the call, and the finger piece operated by dpushed downward tolrelease the ratchet wheel d and the finger d4, whereupon the clockwork b rotates the divers mechanisms described above to make the telephone connection in question. The tongue m contacting with the raised offsets f at times for securing the various interruptions by the aid of the rotation of the insulated segment p, continuously making interruptions as long as the shaft d is rotated. At the end of one revolution the pawl d3 will engage the tooth d2 of the ratchet Wheel d and the prolongation d4 will engage the finger o4 to stop the rotation of the shaft o. When this occurs contact make and break device m', m2 closes the circuit for the telephone. Instead of using both contact make and devices, as shown in Figs. 1-4, only the contact make and break device n', n,- p, n, n may be used. 'I'his may be done by omitting the contact piece m2 and connecting the tongue -m by a rod s in such manner with the make and break device p, n, n' so as to withdraw the arms n from the action of the insulating segment p when no interruptions are required.

In the construction shown in Figs. 6 and 7 the oifsets f instead of being raised beyond the periphery of the disks e are secured by depression, in which case the remaining part of the sections are raised, and therefore the tongue m will be pressed outwardly when no interruptions are required. To lenable this the arms n are pivotally connected together on a bracket 1' and by a small rod or angle piece r are connected to a bell crank lever 12, by which a rod s may be a slide h in such manner as to Withdraw the arms n from the action of the segment p, when it is desired that the telephone line should not be interrupted.

In the construction shown the longitudinal bar t is guided at its end by bolts t and pressed inwardly by springs t2 surrounding said bolts t.

This bar t may be engaged by the tongue m when the tongue m itself is engaged by the raised portions f or by the raised portions f'. In the construction shown in Figs. 6 and 'I it is the raised portions f' intermediate the offsets f, which engage and push outwardly the tongue m. In so doing the bar t Will also be pushed outwardly and being connected by the rod s, the bell crank lever r2 and the angle piece r with the contact arms n will Withdraw these arms or the' contact pieces 1L from engagement with the segment p as shown in Figs. 6 and '7. For correct operation the rear end of the bar t is connected by a rod s similar to the rod s with one arm of a'second bell Vcrank lever r3 the other arm of which is connectedwith a bar t.o with a corresponding arm of the/bell crank lever r2.

Instead of the means shown in the Figs. 6 and 7 to Withdraw the vcontact arms n from the action of the segment p, any other means may be provided, for instance as shown in Fig. 8, the rod s being connected to the contact arms'n by a toggle joint 114] The operation being Well known in the art it need not b`e described in detail.

The disks e may be made in sections in such manner that the Various-sectors, each of which carries one of the offsets f, may be attached to a common disk e by means of set-screws e2, so as to -be removable. By providing a larger number of sectors any desired telephone connection may be provided for.

1. In a transmitter, a pairv of impulse contacts; a rota ting member for intermittently opening and closing said contacts at a predetermined break uniform rate; a shaft; a plurality of code controller disks on said shaft for controlling the impulsing operation of said contacts; a source of driving energy; a positive drive connection from said source to said shaft and rotating member; the connections from said source. to said rotating member driving said rotating member at a plurality of revolutions for each revolution of said shaft; astop member; a pin protruding from said rotating member for engaging said stop member, said stop member being normally out of the path of said pin and means on said disk shaft at a predetermined angular position thereof for controlling the movement of said stop member into the path of said pin to bring said rotating member to a stop at a predetermined angular position. 5

2. In a transmitter, a pair of impulse contacts; a rotating member for intermittently opening and closing said contacts at a predetermined uniform rate; a shaft; a plurality of code controller disks on said shaft; a pair of contacts connected in multiple with said first pair of contacts and operated by said code controller disks for controlling the operation of said impulsing contacts; a source of driving energy; a positive drive connection from said source to said shaft and rotating member; the connections from the source to said rotating member driving 'said rotating member at a plurality of revolutions for each revolution of said shaft; a stop member; a pin protruding from said rotating member for engaging said stop member, said stop member being normally out of the path of said pin and means on said disk shaft at a predetermined angular position thereof for controlling the movement of said stop member into the path of said pin to bring said rotating member to a stop at a predetermined angular position.

3. In a transmitter, a pair of impulse contacts; a rotating member for intermittently opening and closing said contacts at a predetermined uniform rate; a shaft; a plurality of code controller disks on said shaft for controlling the impulsing operation of said contacts; a source of driving energy; a positive drive connection from said source to said shaft and rotating member; the connections from the source to said rotating member driving said rotating member at a plurality of revolutions for each revolution of said shaft; a stop member; a pin protruding from said rotating member for engaging said stop member, said stop member being normally out of the path of said pin, a lever member having a tooth riding over said disk shaft as it rotates and adapted to drop said tooth into a notch in said disk shaft, said lever member controlling said stop member to Amove it into the path of said pin when said tooth drops into the notch and manually operated means for raising said tooth from said vnotch for releasing said shaft for rotation.

4. In a transmitter, a pair of impulse contacts;

ber, said stop member being normally out of the path of said pin; a notch in said disk shaft; a', lever member having a tooth riding over said disk shaft as it rotates and adapted to drop said tooth into said notch in said disk shaft, said lever member controlling said stop member to move it into the path of said pin when said tooth drops into the notch and manually operated means for rais-I ing said tooth from said notch for releasing said shaft for rotation.

5. In a transmitter, a pair of impulse contacts; a rotating member for intermittently opening and closing said contacts at a predetermined uniform rate; a shaft; a plurality of code controller disks on said shaft; a pair of contacts connected in multiple with said rst pair of contacts; a bar extending parallel to said shaft and carrying said second mentioned pair of contacts; manually operated means for associating said second pair of contacts with any one of said controlled disks for controlling said first pair of contacts by theassociated disk; a spring for supplying driving energy; means for maintaining said spring continually tensioned; a positiveA drive connection from said source to said shaft and rotatingmember; the connections from the source to said rotating member driving said rotating member at a plurality of revolutions for each revolution of said shaft; a stop member; a pin 'protruding from said rotating member for engaging said stop mem- 

